Samsung phone explodes moments after mum used it

A Queensland mother has told how her Samsung phone burst into flames just moments after she had been using it.

Yani Barwick bought her Samsung Galaxy S7 second-hand from a friend, and didn't believe the model had any dangerous defects.

Her phone starting warming up in her hand until it got too hot to hold on Wednesday afternoon. It then started smouldering.

"I picked it up and I threw it out into the yard, where it exploded with sparks and a big puff of grey smoke, and it's gone bang!” she told 9NEWS today.

Yani Barwick says she's thankful the phone didn't explode while her son was playing with it. Picture: 9NEWS (9NEWS)The damaged Galaxy S7. Picture: 9NEWS (9NEWS)Ms Barwick said the phone started heating up, began smouldering and eventually exploded. Picture: 9NEWS (9NEWS)

The Beenleigh mother said she is just thankful her one-year-old son, Jackai, wasn't playing with it at the time.

"If it happened to my son, it would be a completely different story. We would probably be in hospital right now with him," Ms Barwick said.

Ms Barwick's phone is one of many Samsung devices which have detonated.